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1、第32卷第2期土木建筑與環(huán)境工程Vol.32No.22010年04月JournalofCivil,Architectural&EnvironmentalEngineeringApr.2010深埋隧道空間結(jié)構(gòu)體系可靠度分析李志華,孫秀麗,華淵(江南大學(xué)環(huán)境與土木工程學(xué)院,江蘇無錫214122)摘要:現(xiàn)行規(guī)范對隧道同類圍巖中某一點(diǎn)的塌方高度進(jìn)行了統(tǒng)計,但未能考慮同類圍巖長度范圍內(nèi)塌方高度的空間變異性,為此提出了圍巖塌方高度空間等效方差增大函數(shù)σh(L)。同時運(yùn)用cWeibull—Бοлοгин脆性破壞統(tǒng)計理論,求得隧道空間結(jié)構(gòu)所用混凝土的等效抗壓強(qiáng)度f
2、e;從而將同類圍巖長度范圍內(nèi)的深埋隧道空間結(jié)構(gòu)體系可靠度問題簡化為平面問題。以金州隧道Ⅲ類圍巖深埋段隧道空間結(jié)構(gòu)為研究對象,分析了節(jié)理間距特征值、圍巖塌方高度均方差上限,隧道長度等因素對其體系可靠度的影響。計算結(jié)果表明,節(jié)理間距特征值越大,可靠度指標(biāo)越高;隨著圍巖塌方高度均方差上限及隧道長度的增長,可靠度指標(biāo)逐漸減小,具有趨于穩(wěn)定的趨勢。關(guān)鍵詞:深埋隧道;空間結(jié)構(gòu);體系可靠度;塌方;等效方差增大函數(shù)中圖分類號:U451文獻(xiàn)標(biāo)志碼:A文章編號:167424764(2010)0220040206ReliabilityAnalysisofSpaceStr
3、ucturalSysteminDeep2buriedTunnelLIZhi2hua,SUNXiu2li,HUAYuan(EnvironmentalandCivilEngineeringSchool,JiangnanUniversity,Wuxi214122,Jiangsu,P.R.China)Abstract:Heightofsimilarrockmasslandslidesinonetunnelsectionwasprocessedwiththestatisticalmethodintheexistingdesigncodes.However,t
4、hespatialvariabilitywithinthesimilarrockmasslengthwasnottakenintoaccount.Inordertoovercometheshortcomings,anequivalentdeviationincreasingfunctionofthespacerockmasslandslidesheightσh(L)wasputforward.AndtheWeibull2Бοлοгинstatisticaltheoryforbrittlematerialsfailurewasemployedtofi
5、ndtheequivalentcompressivestrengthoftunnelsecondaryliningwithdifferentconcretevolumes.Asaresult,theproblemofspacestructuralsystemreliabilityforthedeep2buriedtunnelcouldbesimplifiedasaplaneproblem.TakingtheclassⅢdeep2buriedrockmassinJinzhoutunnelasanexample,thecharacteristicval
6、uesofjointspacing,varianceupperlimitofrockmasslandslidesheightandthelengthofthetunneltoaffectthesystemreliabilitywereanalyzed.Anditwasshownthatthesystemreliabilityindexincreasedwiththeincreaseofcharacteristicvalues.Thesystemreliabilityindexdecreasedgraduallywiththeincreaseofva
7、rianceupperlimitofrockmasslandslidesheightandthelengthofthetunnel.However,thereliabilityindexwouldbetowardsastablevalueattheend.Keywords:deep2buriedtunnel;spacestructures;systemreliability;landslides;equivalentdeviationincreasingfunction隧道結(jié)構(gòu)所處的地層條件復(fù)雜,二次襯砌材料方法比用安全系數(shù)法更加科學(xué)合理。中國《工
8、程結(jié)力學(xué)性能、幾何尺寸、圍巖力學(xué)參數(shù)及荷載等都是不構(gòu)可靠度設(shè)計統(tǒng)一標(biāo)準(zhǔn)(GB50153-92)》第1.0.11確定的。評價
